21641090385 has 16 divisors (see below), whose sum is σ = 34629229440. Its totient is φ = 11540753280.

The previous prime is 21641090309. The next prime is 21641090411. The reversal of 21641090385 is 58309014612.

It is not a de Polignac number, because 21641090385 - 2⁷ = 21641090257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93700 + ... + 228170.

It is an arithmetic number, because the mean of its divisors is an integer number (2164326840).

Almost surely, 2^21641090385 is an apocalyptic number.

It is an amenable number.

21641090385 is a deficient number, since it is larger than the sum of its proper divisors (12988139055).

21641090385 is a wasteful number, since it uses less digits than its factorization.

21641090385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145208.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 21641090385 in words is "twenty-one billion, six hundred forty-one million, ninety thousand, three hundred eighty-five".